Scarifier for tractors



Jan. 12 1926. 1,569,813 R. W. KEELER I SGARIFIER FOR TRAGToRs Filed July a, 1924 2 sheets-sheet 1 Jan. 12 ,1926. 1:569-,813

. R. w. KEELR SQARIFIER FOR TRAGTORS Filed July a, 1924 2 sneets-sheet 2 Patented Jan. 12p, 1926.

UNITED STATES PATENT OFFICE.

\ SCARIFIER FOR TRACTORS.

Application filed July 8,

To all whom z' may concern: w l Be it known that I, RAYMOND IV. Kunnen, citizen of the United States, residing at -Galioin in the county `of Crawford and State of Ohio, have invented certain new anduseful Improvements in Scariers for Tractors, of which the following is a speci- Iication.

This invention relates to road working machines, `and particularly to motor oper ated road working `machines using the motor mechanism of the Fordson tractor mounted upon` a special frame, as illustrated, described and claimed in my pending application for patent Serial #724,907 filed on the 8th day of July 192i.

`This invention particularly relates to road scarifying machines peculiarly de signed for mounting upon the tractor frame illustrated in my pending application above referred to, the scaritier embodying in a general way a tooth-carrying bar mounted upon the rear end of the machine for vertical movement. An object of the invention is to provide a scariier of this character with manually or;` erable means whereby the tooth-carrying bar may be depressed to bring the teeth into engagement with the road, and to provide means which will resiliently urge the toothfcarrying bar downward so as to permit the tooth-carrying bar to rise when the teeth come in contact with an obstruction as, for instance, stones or other material which would tend to break the tooth-carry# ing bar but which will immediatelyact to `depress the tooth-carrying bar into engagement with the earth and give it an elastic pressure against the road. y

y A still further object is to provide means for keeping the teeth mounted upon said bar always at the same angle of engagement with the ground, whether the `teeth be depressed much or little. l i

A still further object is to provide an improved form of tooth-carrying bar of very simple and effective construction so corstructed that two sets of teeth may be mounted upon the barand the teeth be iudividually adjustable so as to bring the points in Contact with the road and to con:- pensate for any wear o1E the teeth andpef 1924. Serial N0. 724,906.

Figure 1 is arearlelevation of atractor having a scarifying attachment constructed in accordance with my invention applied thereto; Y l y c l Figure 2 is a fragmentary sectional viewV of the rear end of the tractor showing the scarifying mechanism in elevation.; Y

`Figure 3 is a sectional view through the tooth-carrying bar andone of the plunger housings, the sectionbeing taken in a vertical plane longitudinally of the machine; i Figure et is a perspective view Loi? ythe scarit'ying bar. j l v In the drawings, I have illustrated so much of atractor as is necessary (for an understanding of myinvention, and in thef-e `worms a drawings lOdesignates the rear ends of the supporting beams of the tractor. These beams are spaced apart at their, rear ends and, as indicated, are of channel iron.. The rear axle of the machine is mounted in ,beam ings upon these rearwardly `extending ends. The transverse channel beam 11 is connected to the beams 10, and mounted upon themiddle of this transverse channel beam 1l a screw shaftsupporting bracket, designated generally 12, the lower end of which is formed` to provide an angular flange lf3 which is riveted, bolted orl otherwise con nected to the beam 11. -The bracket '12 is `formedv to provide upper and lower bearings lfl and 15 `for the worm 16 which is mounted upon the worm shaft 17 and supported in said bearings. Mounted y in the brackets 18, which in turn are mounted upon the` upper `flanges of the beams `10 at the rear ends thereof, is a shaft 19 which carries upon it `at the middle oi the machine thel worm sectorV 20,`this sector having `teeth engaged by the worm 16. The worm segment has aradially extending arm 2l'formed with a; transversely elongated barrel21a at its outer end. On opposite ends oi the beam 11 are mounted the brackets 22, these brackets each being provided with a pair of bearings 23 and 24 in a vertical relation. y

y Rearward ofthe beams 10 is disposed the i scariier beam which, as illustrated. :7s Ieshaped in cross section, the upper and. lower webs 2G and 27 respectively oi the beam being disposed in a horizontal position, while the vertical web of tliu-l beam disposed at a downward and forward inelination. These upper and lower webs 2G and 27 are notched at intervals for the reception of the searilier teeth QS. These scaritiffr teeth are square in cross section and pyramidal at opposite ends. The notches 29 in the forward edges oi" the upper and lower webs are disposed in staggered relation to the notches 29 in the rear edgesof the upper and lower webs and the teeth are disposed in said notches and held in place by means of U-bolts 3() which pass through the vertical web 25 of the toothed bar.

Formed integral with the toothed bar and inward from each endA are a pair of ears 31, and inward of this pair ot ears 3l there is pivoted to the bar a forwardly extending link 32. The link 32 is pivoted to the bar at The outer end of the link 32 is perforated for the passage of a pivot pin 3dwhich passes through the lowermost ears 24. Pivoted to the uppermost ears 23 are the rearwardly extending links 35, which in turn are pivoted by a pivot pin 3G to the ears 3l. There are two of these links and two of the links 232, and it will be seen that the toothed bar is mounted for swinging movement in a vertical plane about the axis oit' the pivot pin 34 and that inasmuch as there are two oi' these links 32 and 35 each connected to the tooth-carrying bar, the tooth-carrying bar will be suiiiciently shifted as the links 32 and 35 move downward to compensate for the change in the angle of the links and 35 andV keep the upper and lower websl 2G and 27 of the tooth-carrying bar always in a horizontal position.

For the purpose of vertically oscillating the tooth-carrying bar, I mount upon the pivot rod 33 or pivot pin or otherwise pivotally connect to the tooth-carrying bar 26 the plungers 37. Each plunger is cylindrical in form, one end of the plunger being formed with an eye for the reception ot the pivot pin 33, the opposite end of the plum gers being rounded otf and the middle of the plunger being formed with an outstanding annular collar or shoulder 38. Pivoted upon the extremity of the arm Q1 is a cylindrical housing 39 which is hollow and which at its upper end is formed with an ear 40, through which the pivot pin Lil passes, which connects the plunger to the barrel 21"'. The lower end ot the housing is closed by an annular cap plate 42 which may be attached to the lianged lower end of the housing in any suitable manner. Disposed within the housing and exerting pressureupon the shoulder 38 is the spring i3 which bears at its upper end against the upper wall of the interior oi. the housing.;r and at its lower end bears against this shoulder and as a consequence urges the plunger downward until the shoulder strikes the cap plate Ai2 whieh nets as a limiting stop.

It will be obvious now that when the seariiiying bar is depressed by depressing the arm 2l, that is by lifting' the segment 20, that the depression of this arm El! will cause the downward movement ol each housing and thus, through the artion ot the spring on the shoulder, will cause the downward movement ol each plunger 25T and the downward movement ot the seurilier bar, but that il the seariitying teeth should strike some obstruction as, for :nstance7 a steile or any other impediment which might art to break the teeth.` the strain will cause the upward movement ol the plunger against the action of the spring iii. 'l`hereiore, the spring lil arts to yield-- ingly hold the teeth to their work.

Also mounted upon the pins ,':ll whieh pirotally engage the end oi the plunger rod with the toothed har are the wheels ff-t. These wheels are two in number and disposed at opposite ends oi.` the bar and normally run upon the ground and limit the downward nuweinent oi the seariiier. The purpose ol: this seariiier is to torre the teeth. down into the road bed to a reriuin degree and the the machine mores along, causingl the teeth to eut up the rond lied and seariiiy it. The teeth are placed at such an inclination that they perform this action without placing undue strain upon the teeth themselves.

Preferably the shaft 1T carries at its upper end a hand wheel t5 whereby the shaft 17 may be operated and whereby the worin wheel 2l) may be operated.

The operation ol the device is obvious from what has gone before. It will be seen that this deviec is very compact, simple, positive in its action and strong, and that the teeth are always presented to the road bed at the same angle.

It will likewise be seen that the two housings with the interior springs permit one end ot the seari 'ng bar or tout]marrying bar to be raised while the other end is held depressed to its full extent by the springr so that thus the tootlueairlving bar may ride over obstacles which are present beneath one end oi.l the bar and which are not present at the other end oi" the bar` and `furthermore such a construction will `pei-mit the tooth-carrying bar to take an ungularrehe tion to a horizontal plane as. i'or instance, in working on roads which are lnterzllly inelined or crowned. This l. regard as a very important i'eature oi.' the invention.

The tractor mechanism which l hare dis lill tier.

closed in4 my pending application before re- :terred to is designed to support a planer such as is disclosed in :my pending application Serial #724,907 filed on the 8th day of July, 1924, and also this scarifying attachment so that the complete tractor will provide a road roller, a planer and a scari- The scarilier will preferably be used when the planer is not used and vice versa, but the attachment is designed to make the roller tractor which I have disclosed in the application before referred to a complete road working machine.

l. The combination with a tractor, oi a scarii'ying mechanism connected therewith comprising a tooth carrying bar, links pivotally connecting the bar to the rear end 4of the tractor and permittingr upward and pair of members havingr telescopic engagement with the first named members and pivotally connected to the tooth carrying bar, means limiting the outward movement of one telescopic member with relation to its coacting other telescopic member, and a spring yieldingly resisting the inward movement of the members one into `the other.

2. The combination with a tractor, of scarit'ying means coacting therewith comprising a tooth carrying bar, a plurality ot' pairs of links pivotally connected to the bar and to the tractor, the pairs of links being disposed in a plurality of vertical planes, means for raising or lowering the tooth carrying bar including an oscillatory member pivotally mounted for oscillation in a vertical plane and having an outwardly extending arm 'formed at its end with a transversely extending barrel, a pair of coacting telescopic members connected to each end of the barrel and to the tooth carrying bar, and springs resisting the movement of one of said membersinto the other member of the same pair, said spring yieldingly urging the scarifying bar downward but permitting the independent upward movement of opposite ends of the scarifying bar.

3. In a scarier of the `character described, a scaritying bar I-shaped in cross section to provide upper and lower `flanges and a connecting web, the upper and lower flanges having aligning notches, the notches on the edge faces of the `flanges on one side of the bar being in staggered relation to the notches in the edge faces of the opposite side of the bar, teeth engaged in said notches, and U-bolts engaging said teeth and passing through the web of the bar.

In testimony whereof I affix my signature.

\ RAYMOND WV. KEELER. 

